05000416/FIN-2009006-06
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Finding | |
|---|---|
| Title | Inadequate Design Control for Standby Service Water Pump Cables and Electrical Vaults |
| Description | The team identified a noncited violation of 10 CFR Part 50, Appendix B, Criterion III, Design Control, for failure to adequately demonstrate operability for the4160 volt Standby Service Water Pump kerite cables through adequate testing and analysis in a continuously submerged environment. Furthermore, the environment for these continuously submerged cables exists because each of the two vaults that contain these cables (MH 20 and MH 21) has a design flaw, in that several other vaults gravity drain to them and the design of these vaults did not include a sump pump or other means for water to be removed or drained from them. The licensee has entered this into their corrective action program as CR-GGN-2009-01028.This finding is more than minor because it affected the mitigating systems cornerstone attribute of design control of ensuring the availability, reliability, and capability of safety systems, and closely parallels Inspection Manual Chapter 0612,Appendix E, Example 3.j, because there was reasonable doubt on the continued operability of the Standby Service Water system. Using the Inspection Manual Chapter 0609, Significance Determination Process, Phase 1 Worksheets, the finding was determined to be of very low safety significance (Green) because it was not a design issue resulting in loss of function, did not represent an actual loss of a system safety function, did not result in exceeding a Technical Specification allowed outage time, and did not affect external event mitigation. The inspectors determined that the finding has a crosscutting aspect in the area of Problem Identification and Resolution in that the licensee failed to implement Operating Experience directly communicated with a Generic Letter through changes to station processes, procedures, and equipment P.2(b) |
| Site: | Grand Gulf  |
|---|---|
| Report | IR 05000416/2009006 Section 1R21 |
| Date counted | Jun 30, 2009 (2009Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | I Anchondo C Ryan C Edwards T Famholtz K Clayton R Kopriva J Adams M Runyan M Bloodgood J Nicely |
| CCA | P.5, Operating Experience |
| INPO aspect | CL.1 |
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Finding - Grand Gulf - IR 05000416/2009006 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Grand Gulf) @ 2009Q2
Self-Identified List (Grand Gulf)
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